Discussion: “Sound Radiation From Point Acoustic Sources With Shield of Large Prolate Spheroidal Baffles” (Cao, X., Wang, M., and Shi, L., 2018, ASME J. Vib. Acoust., 140(4), p. 041016)

The first error appears in Eq. (18) of Ref. [1], where the right-hand side is given to be −∂q/∂t, instead of the correct one –q, where q is the volume displacement per unit volume. So, the correct form of Eq. (18) in Ref. [1] iswith Ψ the velocity potential and c₀ the sound speed in the fluid media. Equation (1) can be easily found from Eq. (7.1.16) of Ref. [2], combined with $fω=−iωρsω$⁠, on page 325 of Ref. [2] and also from Eq. (III.4) (page 46 of Ref. [3]) by using its form in the time domain, combined with the equation p = ρ...